This Sept. 2011 photo provided by Vanguard Defense Industries, shows a ShadowHawk drone with Montgomery County, Texas, SWAT team members. Civilian cousins of the unmanned military aircraft that have been tracking and killing terrorists in the Middle East and Asia are being sought by police departments, border patrols, power companies, news organizations and others who want a bird’s-eye view. (AP Photo/Lance Bertolino, Vanguard Defense Industries) (Lance Bertolino / Associated Press) less

This Sept. 2011 photo provided by Vanguard Defense Industries, shows a ShadowHawk drone with Montgomery County, Texas, SWAT team members. Civilian cousins of the unmanned military aircraft that have been ... more

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Drones carry powerful cameras and can be used to film police operations from above.

Drones carry powerful cameras and can be used to film police operations from above.

Photo: Montgomery County Police Reporter

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An example of another drone that could be used by police forces.

An example of another drone that could be used by police forces.

Photo: Montgomery County Police Reporter

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Lake Conroe, TX

Lake Conroe, TX

Photo: Thomas B. Shea, For The Chronicle

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Lake Conroe, TX

Lake Conroe, TX

Photo: Smiley N. Pool

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Lake Conroe, TX

Lake Conroe, TX

Photo: Smiley N. Pool

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Lake Conroe, TX

Lake Conroe, TX

Photo: Shannon Tompkins, Chronicle

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Police use of drones such as the Draganflyer X6 helicopter is raising privacy concerns among many around the nation.

Police use of drones such as the Draganflyer X6 helicopter is raising privacy concerns among many around the nation.

Photo: ALAN BERNER, MBR

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This undated photo provided by the Mesa County, Colo., Sheriff's Department, Deputy Amanda Hill of the Mesa County Sheriff’s Office in Colorado prepares to use a Draganflyer X6 drone equipped with a video camera to help search for a suspect in a knife attack in Mesa County, Colo. Civilian cousins of the unmanned military aircraft that have been tracking and killing terrorists in the Middle East and Asia are being sought by police departments, border patrols, power companies, news organizations and others who want a bird’s-eye view. (AP Photo/Mesa County Sheriff's Unmanned Operations Team) (Associated Press) less

This undated photo provided by the Mesa County, Colo., Sheriff's Department, Deputy Amanda Hill of the Mesa County Sheriff’s Office in Colorado prepares to use a Draganflyer X6 drone equipped with a video ... more

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$250K police drone crashes into Lake Conroe

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Divers scoured the bottom of Lake Conroe in the hope of recovering a controversial $250,000 police drone that crashed into the water Friday.

The Montgomery County Sheriff's Office confirmed the remote-controlled helicopter drone, which was bought in 2011 with a federal grant, suffered a malfunction and went down during an exercise over the lake.

The drone is equipped with a camera and an infrared scanning device and is used by MCSO for emergency management, missing-person recovery and operation overwatch, for example filming above SWAT team activities, spokesman Brady Fitzgerald said.

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"Divers did go down to look for it. They are still looking. It went down in deep water where there is a rocky bottom. Visibility is also a problem because of sediment at the bottom of the lake," Fitzgerald said Monday.

A further search Tuesday also failed to recover the drone with divers saying choppy water made things difficult.

The mini helicopter, which weighs around 49 pounds, and, in a military setting, could be fitted with a single- or multiple-shot 40mm grenade launcher, 25mm grenade launcher or 12 gauge shotgun, according to Vanguard Defense Industries.

Civil liberties organizations were critical when the ShadowHawk drone was purchased from Vanguard just over two years ago.

At the time, Kirsten Bokenkamp, spokeswoman for the Houston-based American Civil Liberties Union of Texas, said the drones raise concerns because there are not enough safeguards in place to protect citizens from unreasonable search and seizure.

"It's just another example of technology that is outstripping our lives," she said. "What we mean by that, is the technology moves so quickly and the interpretations of the Fourth Amendment are failing to keep up with the technology. That brings privacy concerns."

MCSO officials emphasize that the drone is not used for surveillance.

Drones or unmanned aircraft are governed by the Federal Aviation Administration, which first authorized their use in the national airspace in 1990.

Fitzgerald said deputies were confident the drone would be recovered and further investigation into the crash would follow adding that it was covered by insurance.

"The drone is obviously a tool that we utilize and we would like to have it back," Fitzgerald said.